The belt has a 15-minute automatic shutoff. Switching off at the end of a session is expected. It does not, by itself, mean the battery is empty.
Can I sleep with it on?
No. Stay awake while using the belt and take it off before sleeping. The timer does not make sleeping in it safe.
What if it stops sooner?
If the belt, cable or charging port looks damaged, stop using it and contact us instead of testing it again.
If it stops much earlier than 15 minutes and nothing looks damaged, follow the charging and control checks.
If it still stops early, email support@daywick.com with your order number. Tell us roughly how long it runs, whether you were using heat, vibration or both, and what the controller lights do.
For the full first-use steps, see charging and use.